Pawl-lift for sawmill set-works.



No. 889,677. PATENTED JUNE 2, 1908.

M. HARRIS.

PAWL LIFT FOR SAWMILL SET WO RKS. APPLIUATION FILED SEPT. 30,1907-UNITED STATES PATENT OFFICE.

MONT HARRIS, OF COPPER VALLEY, VIRGINIA, ASSIGNOR OF ONE-HALF TO HENRYR. KIPPS, OF OIIRISTIANSBURG, VIRGINIA.

PAWL-LIFT FOR-SAWMILL SET-WORKS.

Specification of Letters Patent.

Patented June 2, 1908.

To all whom it may concern:

Be it known that I, MONT HARRIS, a citizen of the United States,residing at Copper Valley, in the county of Floyd and State of Virginia,have invented certain new and useful Improvements in Pawl-Lifts forSawmill Set-Works, of which the following is a specification.

This invention relates to sawmills, and pertains especially to a deviceadapted to be a plied to any of the well known set-works of such millsfor affecting a quick receding movement of the set-works.

The object of the invention is to provide a device adapted to be appliedand adjusted to sawmill set-works, and operated in connection with aratchet-pawl to lift an actuating-pawl and a set of stop-pawlssimultaneously so as to free the ratchet-wheel and permit a quick returnor receding movement of the set-works.

A further object of the invention is to provide, in sawmill set-works,novel and peculiar means controlled by a spring to operate anactuating-pawl and a set of stop-pawls relative to a ratchet wheelsimultaneously, whereby the ratchet-wheel is left free for the movementof the sawmill set-works.

A still further object of the invention is to provide, in sawmillset-works, a peculiar combination of links and levers controlled by aspring to permit an actuating-pawl and a set of stop-pawls to engage aratchetwheel, and said spring adapted to be compressed to disengage allof said pawls with said wheel simultaneously.

A still further object of the invention is to provide, in sawmillset-works, a spring controlled lever to operate a set of stop-pawls, anda series of links and levers connected together and with said lever andto another lever to operate an actuating-pawl simultaneously with thestop-pawls.

Various other objects, advantages and .improved results will be foundattainable in and by the special construction, arrangement and operationof the several parts hereinafter to be more fully described and set upin the claims to follow:

In the accompanying drawings forming part of this application: Figure 1is a top view of a portion of a sawmill showing the application of 'theinvention. Fig. 2 is a detail elevation showing the crank engaging theactuating-pawl. Fig. 3 is an elevation looking at .the side of theratchet-wheel and showing the device forming the subject matter of thisinvention. Fig. 4 is a detail perspective view of one of the links. is adetail perspective view of the crank.

The same numerals denote the same arts throughout the several views ofthe rawings.

The journal-bearing 1, for the shaft 2, is mounted as usual on a sawmillcarriage 3, by means of a plate3 and the carriage has ordinary recedingmechanism 4, mounted thereon and operated by a suitable handlever 5 toturn the shaft 2, which operates ordinary head-blocks or knees notshown. The yoke 6, ratchet-wheel 7, hand-lever 8, actuating-pawl 9,stop-pawls 10 and other parts of the set-works, are of the usual wellknown construction and arrangement relative to the shaft 2.

The subject of this invention comprises means for lifting theactuating-pawl 9 and the stop-pawls 10 out of engagement with theratchet-wheel simultaneously, and consists of a lever 11 pivoted at 12and having its free end engaging the stop-pawls 10, a lever 13 pivotedcentrally at 14, to an anglebracket 15 secured to the plate 3*, a link16 pivoted to said lever 18, and to the other end of the lever 11, alink 17 (hereinafter more particularly described) pivoted to the lever13, and to an arm 18, of a crank 19 which engages the actuating-(pawl 9to lift it, a spiral spring 20 interpose between the frame or yoke 6 andthe lever 11, preferably at or near the pivot-point of this lever andthe link 16, and a rod 21, for o erating these various levers and links.T e arm 18 is fixed at one end of the crank 19, and the latter extendsthrough the yoke 6, and has a collar 22, so

that its free end works under the actuatingpawl to lift it. The link 17has a central oiiset 23, which spans the shaft-bearing 1, a dependingpintle 24, at one end of the link 13, and a lateral pivot projection 25at the other end of the arm 18. The link 13, may have two or morepintle-holes 26 therein for the purpose of adjusting the link 17 to varythe throw of the crank as may be desired or as occasion may demand.

It is obvious (all of the pawls engaging the ratchet-wheel) that the rod21 being pushed, the spring is compressed and the various Fig. 5

connected levers and links are thereby automatically operated to effectsuch movement as Will lift all the awls out of engagement with theratchet-w eel simultaneously, leaving the latter free to be turned withthe shaft by the receder device. It will be seen that this device isoperated solely by the rod 21 to lift the pawls, that when pressure onthe rod 21 is removed the spring re-sets the pawls. Thus affording meansfor permitting an operator to have both hands free to operate thereceder while he holds all the pawls lifted by foot pressure on the rod21.

It is obvious that various mechanical changes may be made in the severalparts,

- and their location and connection varied in practical applicationthereof without departing from the spirit of the invention.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is. ,),1'11. In sawmill set-works, aratchet-wheel, an actuating-pawl, stop-pawls, and a device for liftingall of the pawls from saidwheel simultaneously, comprising a leverengaging the stop-pawls, a crank engaging the actuating-pawl, links andlevers pivoted together and pivotally connecting the crank with the saidpawl-lever, a spiral spring expanding against the pawl-lever, and a pushrod for compressing the spring.

2. An attachment for sawmill set-works comprising a ratchet-wheel, anactuatingpaw stop-pawls, a crank journaled in the yoke of the set-worksand engaging the actuating awl, a spring-controlled lever engaging tiestop-pawls, a lever pivoted centrally and having one end connected withsaid pawl-lever, connections between the other end of said pivoted leverand the said crank, and means for operating the said pawllever and thecrank simultaneously.

3. An attachment for sawmill set-works comprising a ratchet-wheel, anactuatingpawl, stop-pawls, a yoke, a crank ournaled 1n the yoke to liftthe actuating-pawl, a lever to lift the stop-pawls, a lever pivotedcentrally and connected to the said stop-pawllever, connections betweenthe centrally pivoted lever and the crank, a spring inter osed betweenthe yoke and the stop-pawlever, and a push-rod for operating the springwhereby all the pawls are lifted simultaneously.

4. In sawmill set-works, the combination, with a ratchet-wheel, itsactuating-pawl, and its stop-pawls, of means for lifting all of thepawls out of engagement with the wheel simultaneously, comprising acrank engaging the actuating-pawl, an arm to which said crank is fixed,a lever engaging the stoppawls, a lever pivoted centrally, a linkpivotally connecting this lever with the said pawlengagingdever, a linkpivotally connecting the said arm with the said pivoted lever, a springexpanding against the pawl-lever, and a push-rod for compressing thespring.

5. In sawmill set-works, the combination, with a ratchet-wheel, anactuating-pawl, and stop-pawls, of means for operating all of said pawlssimultaneously, comprising a springcontrolled lever, a ivoted leverconnected to the spring-contro led lever, a crank having an arm securedthereto, a link having a central set-off and pivotally connecting thesaid pivoted lever and the said arm, and a suitable ush-rod foroperating the spring-controlled ever and the crank simultaneously.

6. The combination, with a ratchet-wl'ieel,

an actuating-pawl, stop-pawls, a shaft upon which the wheel is mounted,a yoke spanning the shaft, and an angle-bracket secured adj acent theyoke and the shaft, of-a crank extending through the yoke above theshaft and engaging the actuating-pawl, an arm fixed to and dependingfrom the crank, a lever pivoted forward of the shaft and engaging thestoppawls, a lever pivoted centrally and connected to the pawl-engaginglever, a link spanning the shaft and connecting the saidcentrally-pivoted lever with the said arm, a spring having one endattached to said pawl-engaging lever and the other end suitablyanchored, and a rod projecting from one of said levers and adapted to bepushed to com ress the sprin for operating all of said paw ssimultaneously.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

MONT HARRIS \Vitnesses:

R. M. CHARLTON, W. K. FAGG.

